DE19608868C1 - Manometer device - Google Patents

Abstract

The manometer is of Bourdon type with a resilient tube (36) open at one end (38) to the pressurised fluid. The other end coupled (46) to a pointer (45) incorporates a vent (52) controlled by a valve (53) whose closure element (54) is adjustable by means of a stop (67) on the inside of a setting ring (73). The fluid is pumped (9) to the primary inlet (6) of a pressure regulator from which a branch (25) is taken to the tube via a filter (64) and a constriction (63) preferably in the form of a narrow annular opening. The ring is preferably part of a cover on the manometer housing with a transparent section through which the pointer can be read.

Description

The invention relates to a manometer device with a Ma tube spring type, which has a housing and the over a curved one end fixed to the housing Tubular spring, the interior of which has a pressure gauge inlet can be acted upon with a pressure medium, the tubular spring depending on what currently prevails in your interior the actuation pressure to a different degree of curvature points and a change in the actuation pressure Ver undergoes formation in the sense of widening or narrowing a display device coupled to the tube spring, the displayed value of the current degree of deformation of the tubular spring depends, and with a vent associated with the tube spring tion valve that commu with the interior of the tubular spring controlled vent.

A manometer device of this type is known from DE 93 00 709 U1 emerged. Your manometer contains a tube spring, also called Bourdon feather is called and which is a bie spring in the form of a circular curved metal tube from  usually flattened on two sides. By more or less strong pressurization of the interior The tube spring takes this more or less strongly curved shape, which in the context of an expansion or Narrowing of the arc diameter deformation to a Display device is transmitted through which correspond to the measured pressure is displayed. You use in the pressure display that is when the pressure is applied to the In inner space of the tubular spring proportional to the pressure force occurring deformation, whereby by suitable mechanical or electrical devices an increased display possible is when the deformation occurring during operation is only slight.

The known manometer device is also with a Ent Ventilation valve equipped that the interior when actuated the tube spring connects to the environment so that air comes out flows. When the air flows out, a whistling sound is generated serves as a warning signal to depend on a below a minimum pressure to draw attention to the fallen actuation pressure. The actuator The valve spring is dependent on the valve spring of their degree of deformation.

About setting the pressure in the to the manometer facility connected lines or facilities prevails and the tube spring as actuation pressure suggests, DE 93 00 709 U1 contains no further details. In pneumatic systems, the desired pressure is usually below Use of a separate so-called pressure control valve, the is often referred to as a pressure reducing valve.  

Such a pressure control valve goes for example from the Technical book "Pneumatic controls", W. Deppert / K. Stoll, Vo gel publishing house, 4th edition 1977, pages 22/23.

The previous ones for setting a desired pressure necessary measures require a complex structure of the used devices. The present invention has become Task set in connection with hiring a constructi connected to a manometer to read the pressure to simplify ven and handling measures.

To solve this problem, the invention is for a manoma tereinrichtung of the type mentioned provided that the Manometer a pressure control unit is assigned, in which the Actuating pressure acts as a control pressure, and that a setting facility is in place to influence the tax pressure a variable specification of the switching state of the vent tion valve depending on the degree of deformation of the tube section that enables.

In this way, there is a manometer device that is not only a pure display function, but also the same early as a device for setting a desired print kes serves. The setting device is a variable pre Giving the switching state depending on the degree of deformation the tubular spring possible, so that the vent valve at one Tubular spring with greater curvature initially closed can be to subsequently after a certain, by the Be expansion caused by the pressure of working together  act with the setting device in an open position approach. If the ventilation opening is released, pressure medium can flow out of the interior of the tube spring, so that the Betä pressure drops and the tube spring in the sense of a vera is deformed. Here the vent valve again closed. This process can be repeated many times where there is an approximate balance between the inflow and the via the vent opening outflowing medium and a resulting actuation pressure remains, which is the setting by the Direction corresponds and as a control pressure for the pressure control unit can be used. By manipulating the on adjusting device, the control pressure can be changed and opened set a desired value, using the display to direction at the same time reading the current pressure value is possible. Thus, it is usually used for displaying nes pressure used manometer device simultaneously as Device for precise setting of a desired pressure usable. Since the control pressure is adjustable on the manometer side, may even be more common in pressure control valves wise existing, counteracting the secondary pressure mechani cal spring device are omitted, which are often only inaccurate Setting the secondary pressure enables. Compared to egg ner change in the bias of the spring can under Ver using the adjustment device a much lighter and Make a more precise setting.

Advantageous developments of the invention are in the Unteran sayings listed.  

A design in which the vent valve is assigned to the vent opening Movable closure member which resiliently in a Vented closing position pre-tensioned is, on the closure member one in the deformation the actuator moving the tubular spring on a displacement path supply part is provided, in which in an opening direction acted upon the valve member relative to the tube Ren spring into the outflow of pressure medium from the inside space of the tubular spring allowing open position is movable, and wherein the adjusting device is arranged on the housing side Neten adjustment stop, which is in the displacement the actuating section is arranged so that in the sense an expansion of the deformation of the tubular spring on the Come to the system and from this in the public direction can be applied, the setting strike in different default positions along the ver storage path of the actuating section is positionable.

For easy adjustment of the desired pressure, the Adjustment device expediently via an adjustable on Manometer housing arranged, especially manually from the outside Her usable actuator that with the vent valve too works together. This actuator can be operated very easily if it is mounted on a rotatable bearing on the pressure gauge housing th collar. Here you can use the collar a particularly simple design from the side wall of a Display device covering, at least partially through  term cover cap on which the adjustment stop can be arranged. This eliminates the need for separate positions medium.

With an appropriate design, there can be between the manometer and the pressure control unit between additional function modules be switched. Such function modules can, for example wise contain switching elements over which the manometer remote control or by direct manual operation and can be switched off, furthermore, for example, the  Function of a safety valve can be integrated or it can the possibility be given to diagnosis and / or control device to be able to connect.

The invention based on the accompanying drawing tion explained in more detail. In this in detail:

Fig. 1 shows a first design of the invention Manome tereinrichtung in perspective view, the gel unit is composed of a pressure gauge and a pressure regulating,

Fig. 2, the Manometer device of FIG. 1 in longitudinal section according to section line II-II of Fig. 1,

Fig. 3 is a schematic plan view of the pressure gauge device approximately corresponding to section line III-III of FIG. 2, wherein the vent valve is shown in the closed position,

Fig. 4 occupies an open position the vent valve bearing portion of the tube spring from Fig. 3, wherein the vent valve,

5 shows a further design of the Manometer device with a processing. A particularly advantageous Ver adjustment mechanism having Einstelleinrich, wherein the pressure control unit and the Röh renfeder and the display device does not Darge are, in longitudinal section,

Fig. 6 shows a detail of the Manometer device of FIG. 5 in the section according to line VI-VI of Fig. 5 with the omission of the housing and

Fig. 7 shows the manometer device of Fig. 1 with a separate manometer and Druckregelein unit and with a hint of an inter mediate functional unit in an exploded view.

The manometer device 1 shown in FIGS. 1 to 6 has two functional units in the form of a manometer 2 and a pressure control unit 3 . The manometer has a double function, in that it is used on the one hand for pressure display and on the other hand for pressure adjustment, whereby it serves as a pilot unit for the pressure control unit 3 in the context of the pressure adjustment.

In the preferred design embodiment shown, the manometer 2 has a cylindrical shape and is fixed via its manometer housing 4 to one of the side faces of the expediently cuboid-shaped regulator housing 5 .

The pressure control unit 3 has a primary pressure inlet 6 and a secondary pressure outlet 7 , which are connected via a Hauptströmungska channel 8 . A pressure medium source 9 can be connected to the primary pressure inlet 6 . The secondary pressure outlet 7 is used to connect to one or more consumers, not shown, which are to be operated at a pressure which is lower than the primary pressure supplied by the pressure medium source 9 .

A control valve 12 is interposed in the main flow channel 8 of the pressure control unit 3 . It has a movable valve member 13 which is designed as a seat valve member and in the closed position shown sealingly bears against a valve seat 14 surrounding the main flow channel 8 and since it is interrupted by the fluid connection between the primary pressure inlet 6 and the secondary pressure outlet 7 .

By the control valve 12 , the main flow channel 8 is divided into an inlet section 16 and an outlet section 17 .

An actuating tappet 15 engages on the valve seat 14 , which protrudes into the outlet section 17 to form an actuating member 18 , which is preferably designed as a bie-elastic membrane. The actuator 18 forms a movable wall of the outlet portion 17 with its outlet 17 facing the surface forms a first actuating surface 22, which is always beat on the pressure prevailing in the outlet 17 secondary pressure beauf.

The actuator 18 separates the outlet section 17 from a control chamber 24 . The opposite surface of the first actuating surface 22 of the actuating member 18 forms a second actuating surface 23 which faces the control chamber 24 .

The actuator 18 is movable in the direction of the switching direction indicated by the double arrow 29 of the valve member 13 relative to the controller housing 5 , but is in the area of its umlau fenden edge 30 in tight connection with the controller housing 5th In the case of the preferred diaphragm design shown, the actuating member 18 is tightly clamped in the region of its circumferential outer edge 30 between two interconnected housing parts 26 , 27 of the regulator housing 5 .

The actuating plunger 15, which is firmly connected to the valve member 13 , lies with its associated end 28 on the first actuating surface 22 of the actuating member 18 when it assumes the neutral position shown in FIG. 2 due to a balanced loading of its actuating surfaces 22 , 23 . Here the valve member 13 is in the closed position. This closed position is stabilized by the different primary and secondary pressures engaging on the valve member 13 , and a spring 32 may additionally be present, which is supported between the regulator housing 5 and the valve member 13 and acts on the latter in the closing direction. This spring 32 also serves in particular to prevent fluttering of the valve member 13 in the event of frequent response.

The amount of the pressure pending at the secondary pressure outlet 7 auslaßseiti (secondary pressure) depends on the control pressure prevailing in the control chamber 24 . If this is greater than the secondary pressure, then the actuator 18 moves to the un th in the direction of the outlet section 17 , whereby it lifts the valve member 13 from the valve seat 14 via the actuating plunger 15 , so that pressure medium is present under the higher primary pressure the inlet section 16 in the Auslaßab section 17 can overflow. When the secondary pressure reaches the level of the control pressure in the control chamber 24 , the actuating member 18 returns to the neutral position, the valve member 13 also returning to the closed position due to the spring 32 .

If the control pressure prevailing in the control chamber 24 falls below the secondary pressure, the actuating member 18 shifts in the direction of the control chamber 24 and lifts off the actuating plunger 15 . The actuator 18 releases an actuating plunger 15 penetrating drain channel 33 , which on the one hand on the end face of the actuator 18 facing end 28 and on the other hand at the opposite end communicating with the atmosphere 34 of the actuating plunger 15 det. Now pressure medium can escape from the outlet section 17 through the drain channel 33 , the secondary pressure falling until the actuating member 18 again assumes the neutral position due to the pressure-related force balance acting on it.

Preferably, a drain valve is integrated in the control valve 12 at the same time, which enables a simple and automatic lowering of the secondary pressure without having to use separate valves.

The pressure medium responsible for the control pressure of the control chamber 24 - in the present pneumatic application it is compressed air - comes, for example, from the inlet section 16 of the main flow channel 8 . This is connected to the control chamber 24 via a control channel 25 .

The arranged on the pressure control unit 3 manometer 2 is of the type tubular spring pressure gauge and has an arcuate spring-elastic and in particular made of metal existing tube element, which is referred to as tube spring 36 . The tube cross-section is approximately rectangular, as indicated in Fig. 2 at 35 , wherein in particular the radially aligned with respect to the center of curvature wall sections of the tubular feet are flattened. Such a tube spring is also referred to as a Bourdon spring.

The tubular spring 36 is fixed at one end 37 on the housing 4 Manometerge. This fixed end 37 of the Manome ter inlet 38 is assigned, through which the hollow interior of the Röh renfeder 36 with pressure medium, here: compressed air, can be acted upon. The supply of the pressure medium takes place from the control chamber 24 , which communicates with the pressure gauge inlet 38 . In game, the manometer inlet 38 is at the stirndeiti gene end of a fixed on the manometer housing 4 connection piece 42 , which is screwed into a opening in the control chamber 24 and has a threaded connection opening 43 of the regulator housing 5 .

The pressure gauge of the manometer is based on an elastic deformation of the tubular spring 36 as a function of the pressure prevailing in it, this pressure being referred to as the actuating pressure. At a lower actuation pressure, the tube spring 36 assumes a more curved shape, which is shown in Fig. 3 in solid lines. Tätigungsdruck with increasing loading the tube spring a reduction in its curvature extends 36 to the purposes. In Fig. 3 is dash-dotted at 41, a corresponding degree of deformation with less spring curvature indicated.

The pressure is displayed via a GE coupled to the tube spring 36 display device 44th For example, an ana log display is provided, the display device 44 having a pointer 45 which is mounted in particular in the center of curvature of the tubular spring 36 and which cooperates with a reading scale (not shown in more detail). Further has the display device 44 via a transmission device 46, via which the area of the free end of the tube spring is coupled to the pointer 45 36 47 so that the deformation of the tube spring 36 a pointer deflection effected and a depending on the current degree of deformation of the Boudon tube display is .

In the case of pressure gauges of conventional design, the tubular spring 36 , apart from the pressure gauge inlet 38 , is sealed off. Deviating from this, the tube spring 36 of the manometer 2 according to the invention is provided with a vent 52 through which the inner space 48 of the tube spring 36 can be connected to the environment, ie to the atmosphere. This vent opening 52 is controlled by a vent valve 53 arranged on the tubular spring 36 , which has a movable closure member 54 assigned to the vent opening 52 . The vent opening 52 is preferably designed as a nozzle opening with a very small flow cross-section.

The closure member 54 can be moved between a closed position shown in FIG. 3 and an open position shown in FIG. 4. In the closed position, the vent opening is closed by the closure member 54 and a escape of pressure medium from the interior 48 of the tubular spring 36 is prevented. Preferably, the closure member 54 is biased by spring force in the closed position. A spring 55 supported on the tubular spring 36 acts upon the closure member 54 in the above-mentioned sense. For example, the Fe of the 55 simultaneously forms the support of the closure member 54 , wherein it is preferably designed like a band spring. In this case, the spring 55 is fixed above its one end 56 on the tube spring 36 , while its freely ending, elastically movable spring section 57 carries the closure member 54 .

In the preferred embodiment shown, the vent opening 52 opens out on the end face of the free end 47 of the tubular spring 36 . There is, the spring tube 36, a seat member 58 carry, on which a venting opening 52 encloses the valve seat 59 is formed. The closure member 54 is designed as a cover, which sits in the closed position comparably bar the function of a seat valve on the valve seat 59 tight.

In the open position according to FIG. 4, the pressure medium located in the tubular spring 36, depending on the deflection of the closure member 54, has a more or less large outflow cross section. The opening of the vent valve 53 is carried out by lifting the closure member 54 from the valve seat 59 while overcoming the spring force acting in the closing direction.

The closing force of the spring 55 is preferably designed such that the maximum actuation pressure occurring in the interior of the manometer device 1 in the interior 48 is not able to switch the vent valve 53 into the open position. A displacement of the closure member 54 into the open position is only possible as a result possible that additionally with the closure member 54 in fixed connection actuating section 62 me is mechanically acted upon in the opening direction.

The operating pressure prevailing in the tubular spring 36 can consequently be influenced by the respectively selected position of the locking member 54 . When the vent valve 53 is open, the actuation pressure drops, and when the vent valve 53 is closed, the actuation pressure can rise.

In order to restrict the inflow of pressure medium into the tubular spring 36 , a throttle point 63 is switched on in the control channel 25 connected to the primary pressure inlet 6 . It reduces the volume flow. The throttle point 63 upstream is expediently a filter 64 , which prevents Ver impurities clog the throttle point 63 or the vent opening 52 , which is preferably also very small. The vent 52 is expediently formed with a nozzle-like narrow cross-section, likewise preferably the throttle point 63 .

The throttle point 63 is preferably formed by a ring part inserted into the control channel 25 , the narrow ring opening of which forms the throttle point 63 . The ring member and filter 64 are held in place by a screw 60 , for example.

In the event of a deformation of the tubular spring 36 caused by changing actuating pressure, the actuating part 62 of the vent valve 53 arranged movably on the tubular spring 36 is displaced, wherein it moves along a displacement path 65 indicated by dash-dotted lines in FIGS . 3 and 4. The actuating section 62 is formed, for example, from the free end of the spring 55 .

A cooperating with the actuating section 62 , arranged on the housing side, adjusting device 66 enables a variable specification of the switching state of the vent valve 53 as a function of the degree of deformation of the tubular spring 36 . So it is a requirement that the vent valve depending on the degree of deformation of the tubular spring 36 assumes a certain switching position. This adjusting device 66 has in the exemplary embodiment a setting stop 67 supported on the housing side, which projects into the displacement path 65 of the actuating part 62 and is infinitely variable in different pre-given positions according to a positioning direction arranged by double arrow 70 along the displacement path 65 . The adjustment stop 67 is assigned to the actuating section 62 in such a way that it can come into contact with a deformation of the tube spring 36 on the adjustment stop 67 in the sense of expansion, and with further expansion of the adjustment stop which is fixed relative to the tube spring 36, stroke 67 in the by Arrow 68 indicated opening direction can be acted upon.

According to the example, the actuation section 62 projects radially beyond the curved tubular spring 36 . The adjustment stop 67 is located on the free end 47 of the tubular spring 36 facing side of the actuating section 62 . If the actuation supply part 62 arrives due to a reduction in the curvature of the tubular spring 36 at the setting stop 67 , the closure member 54 is lifted due to the continued expansion of the tubular spring 36 from the valve member 59 moving away from the closure member 54 . The necessary relative movement between the closure member 54 and the valve seat 59 is ensured by the resilient spring 55 .

The desired default position of the adjustment stop 67 can easily be adjusted manually with the aid of an actuator 69 , which is adjustably mounted on the pressure gauge housing 4 according to the double arrow 70 '. It is formed, for example, by a cylindrical adjusting ring 73 which is placed coaxially on the manometer housing 4 and is held axially immovably and at the same time rotatably on the manometer housing 4 , for example by latching - suitable latching means are indicated at 74 .

The adjusting ring 73 is preferably formed by the circumferential side wall of a cover cap 75 which is placed on the pressure gauge housing 4 and which has a transparent wall 78 on the front side, which is mounted in front of the pointer 45 in the assembled state and enables the pointer position to be read. By simply turning the cover cap 75 , the setting stop 67 can thus be positioned in the desired manner.

The manometer housing 4 provided according to the example has a pot-like shape with a circumferential cylindrical side wall 76 . This side wall 76 is used for centering and pivoting the attached, also pot-like cover cap 75th

The adjustment stop 67 is formed by a projection which is arranged in the embodiment of FIGS. 2 and 3 on the inside of the adjusting ring 73 and protrudes through a slot 71 extending in the circumferential direction of the side wall 76 of the pressure gauge housing 4 in the displacement path 65 mentioned.

Advantageously, not shown Sicherheitsmit tel available, with which the set default position can be releasably set. Such securing means can be formed by housing-side and actuator-side fixed and interlocking threaded elements, which prevent unintentional rotation of the adjusting rings 73 due to the friction between them. It would also be conceivable, for example, to arrange a clamping element on the actuator 69 , which can be braced with the pressure gauge housing 4 .

FIGS. 5 and 6 show a pressure gauge 2, which Einstellein device 66 has a particularly advantageous adjustment mechanism. This allows the setting stop 67 to be set, comparable to the setting technique of camera lenses. A special advantage is that a stepless adjustment with automatic backup of the set default position is possible, the whole thing with an extremely compact design. The size is not or only slightly larger than with a pressure gauge of the usual type.

While beating at the design according to Fig. 2 and 3, the setting Ellan 67 fixed directly on the positioning ring 73, it is based in the case of Fig. 5 and 6 while still ge from genüber the housing 4, but is formed separately from the collar 73, with which he is motion-coupled via a transmission link 79 .

The setting stop 67 is fixed to a bearing part 80 which, for example, is sleeve-shaped and is arranged coaxially in the annular peripheral side wall 76 of the pressure gauge housing 4 . The bearing part 80 is rotatable together with the adjustment stop 67 arranged thereon relative to the manometer housing 4 , the rotation axis 81 indicated by dash-dotted lines advantageously coinciding with the center of the curved tubular spring 36 and the rotation axis of the pointer 45 .

The setting stop 67 protrudes from the annular La gerteil 80 radially inward in the displacement path of the actuation section 62nd

At one point on its circumference, the side wall 76 has an elongated opening 82 which has an oblique course, the direction of extension 84 of which has expansion components running in the circumferential direction 94 of the side wall 76 and at the same time in the axial direction 81 . This opening 82 is located radially in the bearing part 80 and just in case elongated further opening 83 opposite, the direction of extension 85 of which extends from the direction 84 of extension. For example, the direction of extension 85 of the two th opening 83 has an axial course.

The two openings 82 , 83 form a first and a second guide 86 , 87 for the transmission element 79 already mentioned. This engages in both guides 86 , 87 at the same time and is thus displaceably guided in the mentioned first direction of extension 84 according to double arrow 84 'relative to the pressure gauge housing 4 and in the second direction of extension 85 according to double arrow 85 ' relative to the bearing part 80 .

According to the example, the transmission member 79 has a head 88 which runs in the first guide 86 , and a transmission projection 89 which projects radially inwards from this head 88 and which is guided in the second guide 87 .

When the transmission member 79 is acted upon in the axial direction 81 , the transmission member 79 is displaced axially along the first guide 86 and at the same time in the circumferential direction 94 of the side wall 76 . The axial movement component has no influence on the position of the bearing part 80 here because the transmission projection 89 can move unhindered in the axial direction 81 along the second guide 87 . On the other hand, the movement component according to arrow 94 in the circumferential direction of the side wall 76 results in entrainment of the bearing part 80 due to the positive engagement between the transmission projection 89 and the second guide 87 , so that this causes a rotary movement about the axis 81 and a shift of the one adjusting stop 67 in the positioning direction 70 causes.

The necessary application of this to the transmission link of 79 takes place via the adjusting ring 73 . This carries in the region of its inner circumference a circumferential thread 92 , which is arranged, for example, according to the inner circumference of a set on the collar 73 Ge threaded ring. The transmission member 79 is provided on its head 88 on the side facing the adjusting ring 73 with a toothing 93 running parallel to the windings of the thread 92 , which is engaged with the thread 92 in a thread. If now rotated about the locking means 74 axially fixed collar 73 , this has the consequence that the transmission member 79 along the second guide 87 is shifted axially outwards or inwards depending on the direction of rotation.

This results in a rotation of the adjusting ring 73 in the adjustment direction 70 'with a certain reduction in a displacement of the adjustment stop 67 in the same direction positioning 70th Due to the reduction achieved, a very fine, sensitive adjustment is possible. At the same time, it is achieved by the mechanism described that the forces acting upon contact with the actuating section 62 on the setting stop 67 can not automatically adjust the preset position. Each set default position is thus practically automatically secured against unintentional adjustment.

It is understood that the orientations of the two guides 86 , 87 can also be reversed compared to the described design, so that the first guide 86 runs axially ver and the second guide 87 has an oblique course. In addition, it would also be possible to give both guides 86 , 87 an oblique course. According to the selected inclination and the ratio of the inclinations of the two guides 86 , 87 , the degree of translation for setting the pre-given positions can be specified as required.

In the operation of the manometer device flows when applying the primary pressure to the primary pressure inlet 6 compressed air throttled via the control channel 25 into the control chamber 24 and the connected tubular spring. Because of this rising Actuate the supply pressure to the tube spring 36 expands and the pointer 45 indicates the current pressure.

As part of the widening movement, the actuating part 62 initially arranged at a greater distance from the setting stop 67 approaches the setting stop 67 . The distance to be covered until he reaches the setting stop 67 depends on the set default position. Reaches the actuating section 62 the adjustment stop 67 , the spring-loaded closure member 54 is subsequently lifted off the vent opening 52 , which in the exemplary embodiment consists of a nozzle opening having a diameter of approximately 0.3 mm to 0.5 mm. Advantageously, the cross section of the throttle 63 is also in this dimensional range.

An equilibrium is now established between the pressure medium flowing in via the throttled control channel 35 and the pressure medium flowing out via the ventilation opening 52 , which results in an actuating pressure in the tubular spring 36 which corresponds to the preset position. This acts at the same time as a control pressure for the pressure control unit 3 , so that it carries out a corresponding secondary pressure setting.

If the adjustment stop 67 is moved counterclockwise in the direction of the fixed end 37 of the tubular spring 36 , the vent valve 53 closes. As a result, the actuation pressure increases. As a result, the tubular spring 36 widens further until the actuating part 62 interacts with the actuating stop 67 and again an equilibrium pressure which is at a higher actuation pressure is achieved by an identical inflow and outflow rate of pressure medium.

Moving the adjustment stop 67 clockwise, that is to say in the opening direction 68 of the closure member 54 , leads to the release of a larger outflow cross-section in the area of the vent opening 52 than would be necessary to maintain the current actuation pressure. This leads to a pressure drop in the tube spring 36 , so that the tube spring is immediately narrowed and quasi follows the adjustment stop 67 until there is a balance again.

On the display device 44 , the prevailing actuation pressure is displayed, which suitably corresponds to the resulting secondary pressure. In this way, both a pressure setting and a pressure reading can be carried out via the manometer 2 .

Has a set pressure balanced, the United closure member 54 assumes an open position in which the outflowing amount of pressure medium corresponds to the amount of pressure medium flowing in via the control channel 25 into the tubular spring 26 per unit time. Due to the very small flow cross-sections in the control channel 25 and in the vent 52 , the air losses are negligible.

From Fig. 7 it can be seen that between the pressure control unit 3 and the manometer 2 , if necessary, at least one functional unit 77 can be interposed, with which the operation of the manometer device 1 can be influenced and / or which, depending on the operating state of the manometer device 1, certain functions executes. It would be conceivable to design a functional unit 77 as a start / stop functional unit, by actuating which the operating state of the pressure gauge device 1 can be predetermined. A functional unit with an integrated safety valve that has a pressure switch would also be conceivable. It would also be conceivable to have a converter unit that converts pressure signals into current signals, a diagnosis unit or a control unit.

Claims (13)

1. Manometer device, with a manometer ( 2 ) in Röhrenfe derartart, which has a housing ( 4 ) and which has one end ( 37 ) fixed to the housing bent tube spring ( 36 ), the interior ( 48 ) of which has a manometer inlet ( 38 ) can be acted upon with a pressure medium, the tube spring ( 36 ) depending on the currently prevailing in its inner space ( 48 ) operating pressure having a different degree of curvature and a change in the actuation supply pressure a deformation in the sense of widening or narrowing experiences with a coupled with the tube spring ( 36 ) th display device ( 44 ), the value displayed depends on the current degree of deformation of the tube spring ( 36 ), and with the tube spring ( 36 ) associated vent valve ( 53 ), the one with the Interior ( 48 ) of the tubular spring ( 36 ) communicating ventilation opening ( 52 ) dominates, characterized in that the Manometer ( 2 ) a pressure control unit ( 3 ) is assigned to, in which the actuating pressure acts as a control pressure, and that an adjusting device ( 66 ) is present, which for influencing the control pressure a variable specification of the switching state of the vent valve ( 53 ) depending on the degree of deformation the tubular spring ( 36 ). 2. Pressure gauge device according to claim 1, characterized by a pressure control unit ( 3 ) with a regulator housing ( 5 ) which has a primary pressure inlet ( 6 ), a secondary pressure outlet ( 7 ) and in the connection between the primary pressure inlet ( 6 ) and the secondary pressure outlet ( 7 ) interposed control valve ( 12 ), the valve member ( 13 ) of the Steuererven valve ( 12 ) with a preferably designed as a diaphragm actuating member ( 18 ) is operatively connected to the valve member ( 13 ) facing side from the secondary pressure and with its opposite other side delimits a control chamber ( 24 ) which on the one hand lets in with the pressure gauge ( 38 ) and on the other hand has a control channel ( 25 ) with a throttle point ( 63 ) with the primary pressure Admission communicated. 3. Pressure gauge device according to claim 2, characterized in that the valve member ( 13 ) of the control valve ( 12 ) has a with the actuating member ( 18 ) cooperating actuating plunger ( 15 ) which is part of a drain valve serving to reduce the secondary pressure. 4. Manometer device according to claim 2 or 3, characterized in that the manometer housing ( 4 ) in the area of the manometer meter inlet ( 38 ) has a connecting piece ( 42 ) with which it communicates with the control chamber ( 24 ) to the connection opening ( 43 ) of the controller housing ( 5 ) is screwed in. 5. Manometer device according to one of claims 1 to 4, characterized in that the vent valve ( 53 ) has a vent opening ( 52 ) associated with movable closure member ( 54 ) which is biased by spring force into a vent opening ( 52 ) closing position that the closure member ( 54 ) with a moving during the deformation of the tubular spring ( 36 ) on a displacement path ( 65 ) loading actuating part ( 62 ) is connected, in the opening direction ( 68 ) acting upon the closure member ( 54 ) Relative to the tube spring ( 36 ) in a the outflow of pressure medium from the interior ( 48 ) of the tube spring ( 36 ) he open position is movable, and that the adjusting device ( 66 ) has a supporting end on the housing an adjustment stop ( 67 ), which is such is arranged in the displacement path ( 65 ) of the actuating section ( 62 ) that this in the sense of an expense deformation of the tubular spring ( 36 ) against the adjustment stop ( 67 ) and can be acted upon by it in the opening direction ( 68 ), the adjustment stop ( 67 ) in different default positions along the displacement path ( 65 ) of the actuating part ( 62 ) can be positioned. 6. Manometer device according to claim 5, characterized in that the adjusting device ( 66 ) has an adjustable on the manometer housing ( 4 ) arranged, operable from the outside actuator ( 69 ) which serves to position the adjustment stop ( 67 ). 7. Manometer device according to claim 6, characterized in that the actuator ( 69 ) on the manometer housing ( 4 ) rotatably mounted adjusting ring ( 73 ). 8. Pressure gauge device according to claim 7, characterized in that the adjusting ring ( 73 ) from the side wall of the display device ( 44 ) covering at least partially see-through and with respect to the pressure gauge housing ( 4 ) rotatable cover cap ( 75 ) is formed. 9. Pressure gauge device according to one of claims 6 to 8, characterized in that the adjustment stop ( 67 ) is fixedly arranged on the actuator ( 73 ). 10. Pressure gauge device according to one of claims 6 to 8, characterized in that the adjustment stop ( 67 ) for positioning in the default positions relative to the pressure gauge housing ( 4 ) in a with the adjustment direction ( 70 ') of the actuator ( 69 ) coinciding Positioning direction ( 70 ) is movable Lich, and that a with the manometer housing ( 4 ) connected to the first guide ( 86 ) and with the adjustment stop ( 67 ) connected to the second guide ( 87 ) and a simultaneously guided on both guides and by the actuator ( 69 ) be added transmission member ( 79 ) are present, the transmission member ( 79 ) being displaced during the adjustment of the actuator ( 69 ) due to the interaction with the first guide ( 86 ) transversely to the adjustment direction ( 70 ') of the actuator ( 69 ) and by the interaction with the second guide ( 87 ) a displacement of the adjustment stop ( 67 ) in the positioning direction ( 70 ) calls. 11. Pressure gauge device according to claim 10, characterized in that the two guides ( 86 , 87 ) with different Licher alignment transverse to the direction of adjustment ( 70 ') of the actuator ( 69 ). 12. Manometer device according to claim 10 or 11, characterized in that the transmission element ( 79 ) and the actuator ( 69 ) are in threaded engagement with each other. 13. Manometer device according to one of claims 1 to 12, characterized in that the vent opening ( 52 ) is arranged in the area associated with the free end ( 47 ) of the tubular spring ( 36 ) and is preferably located on the end face of the free end ( 47 ). the tube spring ( 36 ).